58 KENR6933
Troubleshooting Section
Recommended Ac
tions
Diagnostic Codes
1. Use the electronic service tool to check for any
diagnostic codes that may be related to high fuel
consumption.
Misreading of Fuel Level
1. Monitor t he fuel consumption over a period of 50
engine hours. If the fuel consumption is excessive,
perform the fo
llowing procedure.
Fuel Quality
1. The quality of the fuel that is used in the engine
will affect the rate of fuel consumption. Refer to
“General Fue
l Information” in the Operation and
Maintenance Manual, “Refill Capacities”.
2. If the fuel is
not of an acceptable quality, drain
the fuel system and replace the fuel filters. Refill
the fuel system with fuel of an acceptable quality.
Refer to the
applicable sections in the Operation
and Maintenance Manual.
3. If the fuel i
s of an acceptable quality, refer to
“Quality of Oil”.
Quality o f O
il
1. The nominal viscosity of the lubricating oil that
is used in th
e engine will affect the rate of fuel
consumption. The viscosity of lubricating oil is
defined by the SAE grade of the lubricating oil.
The grade o
f the lubricating oil must be correct
for the ambient conditions. Lubricating oil that is
intended for use in high ambient temperatures
will have
a negative effect upon the rate of fuel
consumption in cold ambient temperatures. Refer
to “Engine Oil” in the Operation and Maintenance
Manual, “
Refill Capacities”.
2. The actual viscosity of the lubricating oil that is
used in th
e engine will change throughout the
service life of the oil. Lubricating oil that is heavily
contaminated will have a negative effect upon the
rate of f
uel consumption.
3. If the oil is not of an acceptable quality or if the
oil has e
xceeded the service life, drain the oil
system and replace the oil filters. Refill the oil
system with oil of an acceptable quality. Refer
to the a
pplicable sections in the Operation and
Maintenance Manual.
4. If the o
il is of an acceptable quality, refer to
“Operation in Cold Conditions”.
Low Engine Temperature
1. The operating temperature of the engine will affect
the rate of fuel consumption. Operation of the
engine below t
he correct temperature will increase
fuel consumption. Failure of the water temperature
regulator can prevent the engine from operating at
the c orrect t
emperature.
2. If the engine operating temperature is low, check
the operatio
n of the water temperature regulator. If
the water temperature regulator does not operate
correctly, a new water temperature regulator must
be installed
. Refer to Disassembly and Assembly,
“Water Temperature Regulator - Remove and
Install”.
Prolonged Operation at Idle Speed
Prolonged o
peration of the engine at idle speed
increases fuel consumption.
When the eng
ine is operated at idle speed, the fuel
that is consumed provides no useful work. Prolonged
operation at idle speed will cause a measurable
deteriora
tion in the overall fuel consumption of the
engine.
Operation
of the engine for long periods at idle
speed will cause a deterioration of the internal
components of the engine. A deterioration of the
internal c
omponents of the engine will increase fuel
consumption.
Engine Op
erating Speed
The operating speed of the engine will affect the rate
of fuel co
nsumption.
High engine speed will increase fuel consumption.
At high en
gine speeds, internal power losses in
the engine increase and more power is required to
drive the alternator and the fan. These power losses
increas
e f uel consumption.
Lugging down the engine to a low engine speed will
increas
e fuel consumption. At low engine speeds, the
combustion efficiency of the engine is reduced. This
will require more fuel to be used.
Air Inlet and Exhaust System
Leakage
of gas or an increased restriction in either
the air intake or the exhaust system can reduce
the flow of combustion gas through the engine. A
change
in the flow of combustion air into the engine
adversely affects combustion efficiency and the rate
of fuel consumption.
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